Formwork for Concrete Structures by R.L.Peurifoy and G.D- By EasyEngineering.net

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CHAPTER 5
Design of
Wood Members
for Formwork
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General Information
The terms timber, lumber, and wood are often used interchangeably in
the construction industry. In general, timber is used to describe larger
size members, whereas lumber is used for smaller size members. In
either case, both timber and lumber are made from wood.
Wood is an ideal material for construction. It is lightweight, which
makes it easy to handle at the jobsite. It is also easily fabricated to
almost any configuration by cutting and fastening together various
combinations of standard size lumber.
Design of wood members involves selection of the size and grade
of lumber to withstand the applied loads and deflections. The applied
loads produce stresses in a member; including bending, shear, compression,
and bearing. The selected member must also have enough
rigidity to prevent excessive deformations and deflection.
Arrangement of Information in This Chapter
The beginning sections in this chapter present the basic equations for
analyzing beams, including analysis of bending moments and shear
forces. The basic equations for calculating stresses and deflection of
beams are also presented and illustrated. Following the sections concerned
with the analysis, Table 5-2 summarizes the equations commonly
used in the analysis of beams for formwork. Table 5-2 is
valuable and frequently referenced in this book to calculate bending
stress, shear stress, and deflection during the process of analyzing
and designing formwork and temporary structures.
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